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Vulnerabilities

Vulnerability · CVE-2020-1025

An elevation of privilege vulnerability exists when Microsoft SharePoint Server and Skype for Business Server improperly handle OAuth token validation.

Published Jul 14, 2020 · catalog updated Jun 17, 2026 · An elevation of privilege

Last checked Nov 2, 2026. A connected source was read within the last 7 days.

Check if you run it

No confirmed exploitation is on record for CVE-2020-1025. EPSS is 5.85%. Act only if a listed version of An elevation of privilege is installed.

Gaps on this record

  • The stored product name is a package slug. The name on this page is taken from the title (An elevation of privilege).
  • No version range is stored. A customer cannot check an installed version against this record.
  • No vendor fix or required action is stored. Compare the linked advisory before you change production.
Severity
Critical9.8
Known exploitation
Not in CISA/VulnCheck KEV
EPSS
5.85%
Remediation
Advisory link
Affected products
cpe microsoft/lync · cpe microsoft/sharepoint enterprise server · cpe microsoft/sharepoint foundation · cpe microsoft/sharepoint server · cpe microsoft/skype for business

An elevation of privilege vulnerability exists when Microsoft SharePoint Server and Skype for Business Server improperly handle OAuth token validation. An attacker who successfully exploited the vulnerability could bypass authentication and achieve improper access. To exploit this vulnerability, an attacker would need to modify the token. The update addresses the vulnerability by modifying how Microsoft SharePoint Server and Skype for Business Server validate tokens.

Are you affected?

Enter the version you run. The result uses only the ranges stored on this record.

The check returns affected, not affected, or incomplete. It does not guess a version that is missing from the record.

  • cpe microsoft/lync2013
  • cpe microsoft/sharepoint enterprise server2016
  • cpe microsoft/sharepoint foundation2013
  • cpe microsoft/sharepoint server2019
  • cpe microsoft/skype for business2015
  • cpe microsoft/skype for business2019

How to fix CVE-2020-1025

  • No stored fix

    No vendor fix text is stored. Use the linked advisory before you change production.

  • Version check

    No version range is stored, so an installed version cannot be checked on this page.

  • Advisory

    Open the cve_org record and follow its fix.

  • Official advisories

What to do

Three questions, each answered from this record only. Confirm the vendor advisory before you patch.

Should you patch?

No confirmed exploitation is on record for CVE-2020-1025. EPSS is 5.85%. Act only if a listed version of An elevation of privilege is installed.

Which versions are affected?

Compare what you have installed with microsoft/sharepoint enterprise server 2016; microsoft/sharepoint foundation 2013; microsoft/sharepoint server 2019; microsoft/skype for business 2015. Compare the installed version with the linked vendor advisory before you change production.

What should an analyst verify?

CWE-20: Improper Input Validation. EPSS 5.85%. There is no CISA KEV listing. No Exploit-DB or Metasploit reference is linked. Use the source links for the original advisory.

Technology hubs

Microsoft SharePoint security

Code

The project this record applies to. Exploit listings stay in References.

No public source repository is identified for this product.

Timeline

Detection, updates, and resolution for this record.

  1. Jul 14, 2020 · Monitored products — critical

    Detected

    An elevation of privilege vulnerability exists when Microsoft SharePoint Server and Skype for Business Server improperly handle OAuth token validation. An attacker who successfully exploited the vulnerability could bypass authentication and achieve improper access. To exploit this vulnerability, an attacker would need to modify the token. The update addresses the vulnerability by modifying how Mic

  2. Jun 17, 2026 · Monitored products — critical

    Updated

    An elevation of privilege vulnerability exists when Microsoft SharePoint Server and Skype for Business Server improperly handle OAuth token validation. An attacker who successfully exploited the vulnerability could bypass authentication and achieve improper access. To exploit this vulnerability, an attacker would need to modify the token. The update addresses the vulnerability by modifying how Mic

Sources

  • CVE.orgVulnerability recordCVE-2020-1025

    Official CVE identifier

    cve.org
  • Monitored products — criticalVendor advisoryCVE-2020-1025

    An elevation of privilege vulnerability exists when Microsoft SharePoint Server and Skype for Business Server improperly handle OAuth token validation. An attacker who successfully exploited the vulnerability could bypass authentication and achieve improper access. To exploit this vulnerability, an attacker would need to modify the token. The update addresses the vulnerability by modifying how Mic

    nvd.nist.gov

References

Freshness

Last verified in this catalog Nov 1, 2026. Significant claims (KEV, EPSS, CVSS, affected ranges) come from the source rows above — open the original publisher for the authoritative advisory.

  • CVE.orgNov 2, 2026
  • Monitored products — criticalNov 1, 2026